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. 2015 May 27;10(5):e0125923. doi: 10.1371/journal.pone.0125923

Fig 9. Fluorescent black light vs.

Fig 9

blue laser. A direct comparison between a 15 watt fluorescent UV light illuminating all the fossils at a distance of 7cm, and a 447nm 500mw laser stimulating the specimens in the upper left corner. A, Specimens from the Lance Formation exhibit very low reactivity under fluorescent UVA bulbs. B, Specimens from the White River Formation typically fluoresce very well. This demonstrates that the intensity of laser stimulation can influence low reactivity specimens to fluorescence several orders of magnitude better than specimens known to fluoresce well under UV bulbs. Scale bar 1 cm.